1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <functional>
11
12 // less
13
14 #include <functional>
15 #include <type_traits>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "pointer_comparison_test_helper.hpp"
20
main()21 int main()
22 {
23 typedef std::less<int> F;
24 const F f = F();
25 static_assert((std::is_same<int, F::first_argument_type>::value), "" );
26 static_assert((std::is_same<int, F::second_argument_type>::value), "" );
27 static_assert((std::is_same<bool, F::result_type>::value), "" );
28 assert(!f(36, 36));
29 assert(!f(36, 6));
30 assert(f(6, 36));
31 {
32 // test total ordering of int* for less<int*> and less<void>.
33 do_pointer_comparison_test<int, std::less>();
34 }
35 #if TEST_STD_VER > 11
36 typedef std::less<> F2;
37 const F2 f2 = F2();
38 assert(!f2(36, 36));
39 assert(!f2(36, 6));
40 assert( f2(6, 36));
41 assert(!f2(36, 6.0));
42 assert(!f2(36.0, 6));
43 assert( f2(6, 36.0));
44 assert( f2(6.0, 36));
45
46 constexpr bool foo = std::less<int> () (36, 36);
47 static_assert ( !foo, "" );
48
49 constexpr bool bar = std::less<> () (36.0, 36);
50 static_assert ( !bar, "" );
51 #endif
52 }
53